Air cooled cylinder head



June 14, 1955 R. KLOSS AIR COOLED CYLINDER HEAD 2 sheets-sheet 1 Filed Aug. 11. 1951 June 14, 1955 R. KLOSS 2,710,601

AIR COOLED CYLINDER HEAD Filed Aug. 11, 1951 2 Sheets-Sheet 2 7%:{8/1/ lifent.

United States Patent AIR COOLED CYLINDER HEAD Richard Kloss, Koln-Buchforst, Germany, assignor to Klockner-Humboldt-Deutz A. G., Koln, Germany Application August 11, 1951, Serial No. 241,469

Claims priority, application Germany February 8, 1951 8 Claims. (Cl. 123-4161) The present invention concerns an air cooled cylinder head for internal combustion engines in which the lateral cooling fins extend substantially transverse to the axis of the cylinder cooperating with the cylinder head, while recesses or passages are provided in said cooling fins to allow the passage of connecting bolts therethrough for connecting said cylinder head to the cylinder block.

A cylinder head of the above-mentioned type is as a rule so constructed that, seen in the direction in which the cooling air hits the cylinder head, there are provided at the sides of the cylinder heads two recesses or passages arranged in series for the passage of the connecting bolts. The cooling efiect of the cooling air hitting the cylinder head is best when the cooling .air passes through the cooling fins from the side at which the cooling air hits the cylinder head to the side where the cooling air leaves the cylinder head. However, tests have shown that with the constructions heretofore known the air does not pass all the way through the cooling fins in the manner just mentioned so that the desired cooling effect will not be obtained. This is due to the fact that the recesses for the passage ofthe connecting belts interfere with the air current and deviate the same. More specifically, the cooling air, seen in the direction in which the air hits the cylinder head is interfered with by the front recesses in such a-manner that the cooling air does not pass between the cooling fins in front of said recesses or free spaces (seen in the direction in which the air hits the cylinder head), but takes the way of least resistance and enters from the top into the free spaces or recesses.

It is, therefore, an object of the present invention to provide an air cooled cylinder head which will overcome the above-mentioned drawbacks.

- It is another object of this invention to provide an air cooled cylinder head in which the cooling air will be forced to pass through the cooling fins all the way from the side where the cooling air hits the cylinder head to the opposite side where the cooling air leaves the cylinder head.

It is still another object of this invention to provide an arrangement which, while not limited to diesel engines, will be particularly advantageous for cylinders having a precombustion chamber adjacent that side of the cylinder head which is first hit by the cooling air.

A still further object of this invention consists in the provision of means for use in connection with a cylinder head for internal combustion engines which will materially improve the cooling effect with internal combustion engines having a plurality of cylinders arranged in line, while the cooling air is first blown into a reception room alongside the cylinder from which it passes to the cylinders.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings in which:

Cir

2,710,601 Patented June 14, 1955 ice Figure 1 shows a side view of a cylinder head according to the present invention.

Figure 2 represents a section along the line IIII of Figure 1.

Figure 3 diagrammatically illustrates a top view of a row of four cylinders having sheet metal guiding members according to the invention extending into a cooling air receiving chamber adjacent said cylinders.

General arrangement With diesel engines, the precombustion chamber is usually located at that side of the cylinder head which is first hit by the cooling air, inasmuch as the precombustion chamber becomes rather hot during the operation of the diesel engine. For this reason it is neces sary that the cylinder head is particularly well cooled at the oncoming side of the cooling air. This portion of the cylinder head can, however, be cooled sufliciently only, if the cooling fins, located in front of the free spaces or recesses through which the connecting bolts are passed, become fully efiective. v

In order to obtain full eifectiveness of the last-mentioned cooling fins, the recesses or free spaces through which the connecting bolts are passed are, according to the present invention, covered up at the upper portion of said recesses or free spaces. This covering up of the free spaces or recesses may, for instance, be effected by a plate. Advantageously, such a plate is slid in between the uppermost two cooling fins adjacent the said free spaces so that the free spaces are covered up. In this Way, the air flowing along the cooling fins located in front of said free spaces cannot enter the latter but is guided on along said covering plates to the next following cooling fins.

Structural arrangement Referring now' to the drawings in detail, the structure shown therein comprises a cylinder head having. a base body 1 which, rests on a cylinder. (not shown in the drawings) by means of a gasket 2 and is connected to said cylinder by means of connecting bolts 3.. The cylinder head shown in the drawing is one intended for a four-stroke cycle engine. The cylinder head is provided with channels 4 and 5 for cooperation with the inlet and outlet valves respectively. The cylinder head is furthermore provided with a combustion chamber 6 into which extend from the top an injection nozzle 7 and a glow plug 8. Mounted on top of the cylinder head is a casing 9 which contains the rocking levers for actuating the inlet and outlet valves 10 and 11 respectively. In order to increase the cooling area, the cylinder head is in well known manner provided with cooling fins. The lateral cooling fins are desig mated with the reference numeral 12 and extend in a direction substantially transverse to the longitudinal axis of the cylinder pertaining thereto. The cooling air passes toward the cylinder head in a direction indicated by the arrow a. In order to allow the passage of the connecting bolts 3 for connecting the cylinder head to the respective cylinder block, the cooling fins 12, are provided with free spaces or recesses 13. As will be clear from the drawing, two such free spaces 13 are arranged in series on each side of the cylinder head. As will furthermore be seen from the drawing, those free spaces 13 located at the front are covered up by.

a plate 14. The plates 14 are retained in their respec- In lat vious, particularly from Figure 2, the free spaces formed by the recesses of two cylinders lying .side .by side may be covered up by a plate common to both.

With an internal combustion engine having a plurality of cylinders 1 arranged in line (see Fig. 3), it is known to provide a blower 17 "for the cooling air at the end of the cylinder row. This blower blows the cooling air into a receiving chamber 18 arranged alongside said cylinder row, and from this receiving chamber the cooling air passes towards the cylinders. The cooling of the cylinder heads of such internal combustion engine may be materially improved when the guiding sheet metal member, which serves for guiding the air, catches the cooling air. This effect may be materialized by extending into the reception chamberthose portions 19 of the guiding sheet metal member which are arranged at the rear side of the cylinder heads (seen in the direction of the axis of the blower and in the direction in which the cooling air flows).

'It is of course understood that the present invention is by no means limited to the particular construction shown in the drawings but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. An air cooled cylinder head for internal combustion engines, which comprises in combination, cooling fins connected to 'said cylinder head and having their major surfaces substantially parallel to the bottom of said cylinder head, said fins being provided with cutout portions forming passage means having the longitudinal axis thereof substantially perpendicular to said major surfaces to allow the passing of connecting bolts therethrough for connecting said cylinder head to a cylinder block, and flat bridging means engaging at least one fin provided with a cut-out portion and located at the entrance to said passage means and covering up this entrance so as to allow the oncoming air in a continuous flow to pass between the fins below said bridging means and to prevent the on-coming cooling air from entering said passage means from the 'top thereof.

2. An air cooled cylinder head for internal combustion engines which comprises in combination: cooling fins connected to said cylinder head and having their 1 major surfaces extending substantially parallel to the bottom of said cylinder head, said fins having cut therethrough passage means extending in a direction substantially perpendicular to said major surfaces and adapted to 'allow'the insertion of connecting bolts therethrough for connecting said cylinder head to the cylinder block pertaining thereto, and detachable sheet means engaging at least one of the fins at the upper portion of said .passage means and bridging said pass'a'g'e means so as to prevent the oncoming cooling air from entering said passage means from the top thereof.

3. An air cooled cylinder head for internal combustion engines which comprises in combination, cooling fins connected to two opposite sides of said cylinder head and having cut therethrough passage means for passing bolts therethrough to connect said cylinder head with the cylinder block pertaining thereto, and plate means interposed between two adjacent cooling fins at the upper portion of said passage means for preventing the oncoming cooling air to enter into said passage means from the top thereof.

4. .An air cooled cylinder head for internal combustio'n engines which comprises in combination, cooling fins connected to two opposite sides of said cylinder head and having cut therethrough passage means for passing bolts therethrough to connect said cylinder head with the cylinder block pertaining thereto, and

plate means interposed between the two uppermost .cooling fins on each side of the upper portion of said passage means for preventing the oncoming cooling air from entering said passage means from the top thereof.

5. An air cooled cylinder head for internal combustion engines which comprises .in combination, cooling fins connected to two opposite sides of said cylinder head and having cut therethrough passage means for passing bolts therethrough to connect said cylinder head with the cylinder block pertaining thereto, plate means interposed between two adjacent cooling fins at the upper portion of said passage means for preventing the oncoming cooling air to enter into said passage means from the top thereof, and guiding means surrounding said cylinder head for guiding the cooling air thereto, said guiding means extending laterally of said plate means so as to prevent the lateral movement of said plate means.

6. An air cooled cylinder head for internal combustion engines which comprises in combination, cooling fins connected to two opposite sides of said cylinder head and having cut therethrough passage means for passing bolts therethrough to connect said cylinder head with the cylinder block pertaining thereto, and plate means interposed between two adjacent cooling fins at the upper portion of said passage means for preventing the oncoming cooling air to enter into said passage means from the top thereof, said plate means being provided with protruding portions having such a height as frictionally to hold and retain said plate means between said adjacent fins.

7. .An air cooled cylinder head arrangement with two cylinder heads located side by side which comprises in combination, cooling fins respectively connected to each cylinder head, said fins having cut therethrough passage means to allow the passage of connecting bolts therethrough for connecting said cylinder heads to the respective block, and plate means common to said two adjacent cylinder heads for covering up those passage means located between said two adjacent cylinder heads, thereby preventing the oncoming cooling air from entering said 1ast-mentioned passage means from the top thereof.

8. An arrangement of a plurality of cylinder heads arranged in .line for use in connection with an internal combustion engine having a cooling blower arranged at one end of said engine for blowing cooling air into a reception chamber arranged alongside said line of cylinders, which comprises in combination, cooling fins respectively connected to said cylinder heads, said cooling fins having cut therethrough passage means for passing connecting bolts therethrough to connect said cylinders with the cylinder block pertaining thereto, plate means interposed between adjacent cooling fins at the upper ends of said passage means for respectively covering up said passage means to prevent oncoming cooling air from entering .said passage means from the top thereof, and guiding sheet metal means arranged at the rear end of said cylinder heads and extending into said reception chamber.

RcferencesCited in the file of this patent UNITED STATES PATENTS 2,152,043 Gregory Mar. 28, 1939 2,323,281 'DePew June 29, 1943 2,510,484 Sheppard June 6, 1950 FOREIGN PATENTS 466,880 Erance e Mar. .16, 1914 165,906 GrcatBritain July 4, .1921 

